embassy in tripoli, libya, temporarily, they said, for security reasons. the department wouldn't say whether there had been a threat. earlier this month, the u.s. consulate in benghazi, libya, was attacked and burned, and ambassador chris stevens and three other americans were killed. that attack took place amid violent protests that broke out over an internet movie that ridiculed islam. well, late today, the filmmaker, was arrested in los angeles. federal prosecutors say that by uploading the film on the internet, he violated the terms of his probation on a previous check fraud conviction. iowa kicked off the primary and caucus season. well, today it became th first battleground state to in the general election. at least 400,000 iowans are expected to vote before election day, november 6. in other battleground states, voting begins in colorado october 22, more than two million people are expected to cast early ballots there. in florida, balloting starts october 27 with more than four million early voters expected. john dickerson is in our washington burea